Agnes Marie Constanze von Hartmann, who wrote under the names A. T. and A. Taubert, was a German philosopher associated with post-Schopenhauerian pessimism. Born in Stralsund and later based in Berlin, she married the philosopher Eduard von Hartmann in 1872 and wrote in defence of his Philosophy of the Unconscious (1869). She published two books, Philosophie gegen naturwissenschaftliche Ueberhebung (1872) and Der Pessimismus und seine Gegner. Frederick C. Beiser has described her as a participant in the German pessimism controversy and as one of the first women to have a prominent role in a public intellectual debate in Germany.